Return a Query-Callback result

If you want to just check if there is any row, use "SELECT COUNT(*) FROM ..." and retrieve the rows returned with cache_get_row_int (rowid 0). That way, you won't select ALL the data for nothing.

For now, if you want to have a function that returns 0/1 the only way is non-threaded queries. In R40, there'll be support for references by the way.

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Return a Query-Callback result